Gate-valve.



Patented May l4, l90l.

J. POWELL.

GATE VALVE.

(Application filed Sept, 25, 1900.)

(No Model.)

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m: Roam: mans w. mmomuo wAsmnuTcN u c UNITED STATES PATENT OFFICE.

JAMES POWELL, OF CINCINNATI, OHIO.

GATE-VALVE.

"\i I SPECIFICATION forming part of Letters Patent No. 673,925, dated May 14, 1901.

Application filed September 25,1900. Serial No. 31,056. on model.)

To ctZZ whom, it may concern.-

Beit known that 1, JAMES POWELL, acitizen of the United States of America, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Gate-Valves, of which the following is a specification.

The object of myinvention is a gate-valve in which the operation of seating the valve is accomplished with a minimum amount of friction and that of unseating requires the exertion of little force. This object is attained by the means described in the annexed specification and illustrated in the accompanying drawings, in which Figure 1 is a top plan view of a gate-valve embodying my invention, the cap being removed from the case to expose the interior thereof and the rock-shaft and its packinggland being shown in dotted line to show the shape of that part of the case beneath them. Fig. 2 is a longitudinal vertical sectional view of the same, taken upon line as m of Fig. 1, the nearer valve-disk being removed to expose the wedging-link that couples the disk and the vibrating lever, the full lines showing the valve-disk standing opposite its seat and the position of the lever and link before said disk is carried to its seat, the dotted lines showing the position of the same when the valve is seated. Fig. 3 is a longitudinal vertical sectional view showing the valve-disk raised. Fig. 4 is a detail top plan view of the vibrating lever and the wedging-link. Fig. 5 is a similar View of one of the valve-disks.

Referring to the parts, valve-case A has extensions a a at diametrically opposite points upon its sides to receive the intercepted ends of a conduit, forming through the case a direct channel which is encircled by valve-seats a formed in each wall of the case, which has an upward extension 0. the upper end of which is interiorly screw-threaded to receive a cap (not shown) and upon the interior of which are formed ways a a to guide the valvedisks B B, which have straight sides I) b to fit against said ways, and each of which has an inwardly-projecting pin b surrounding which is a collar cut out at regular intervals to form a series of segmental wedges b Case A has also a rearward extension on, within which a rock-shaft C is journaled, so that it is above and parallel to the channel. Upon shaft C is secured a vibrating lever D, at the free end of which is pivoted a link E, which consists of a short cylinder e of the same circumference as the collars upon the valvedisks, with backwardly-projecting arms 6' e passing upon each side of the lever. Cylinder 6 has also at each of its ends a series of segmental wedges 6 of the same size as but inclined in an opposite direction from wedges b so that when pins 1) are passed into the ends of cylinder 6 the wedges fitone into another, as shown in Fig. 1. In the raised position of the vibrating lever the valve-disks stand in their ways above the channel, as shown in Fig. 3. When the lever descends, and while the valve-disks are being moved down in their ways thereby, the ends of wedges e bear against the ends of wedges 17 so that the wedges fit one into the other, as shown in Fig. 1, and the disks bear loosely against the walls of the case and slide easily in their ways. After the valve-disks have been carried to the lower limit of their travel and stand opposite their seats the further rotation of the rockshaft and the lever rotates link E backward upon pins 6 as shown in dotted lines, Fig. 2, causes wedges b to ride up on wedges e spreads valve disks B B apart, and brings them firmly against their seats. When lever is rotated in the opposite direction, link E at the beginning of the movement is rotated forward, releasing the valve-disks from the seats before they are raised in their ways. Thus it is seen that there is no friction between the valve and its seat and that it requires little force to unseat the valve.

It is of course obvious that more mechanical changes might be made upon my valve. For-instance, the collar upon one of the disks might not be out into wedges and the end of the link-cylinder, against which it abuts, might be left plain, or one of the disks might be omitted entirely and the end of the cylinder of the link extended and enlarged upon the side of the omitted disk to bear against the walls of the case, or one annular wedge might be used upon the disks in place of a series of wedges, as shown, together with an annular wedge upon the link-cylinder in place of the series of wedges thereon without departing from the spirit or scope of my invention.

What I claim is 1. In a gate-valve the combination of a case having a channel therethrough a valve-seat in its Wall encircling the channel and ways in the walls, a disk valve in said ways having an inwardly-projecting wedge upon its inner face, a vibrating lever, and a link pivoted at one end to the lever at the other end to the disk and having an inwardly-projecting wedge to fit into the wedge upon the disk while the disk is descending to a point opposite its seat and then by the further. rotation of the lever to ride up on said wedges to force the valve-disk to its seat, substantially as shown and described.

2. In agate-valve the combination of a case having a channel therethrough valve-seats in its walls encircling the channels and ways leading to the valve -seats, a pair of disk valves to be reciprocated in the ways each having inwardly-proj ecting wedges, a vibrating lever, and a link pivoted at one of its ends to the lever and at the other to the disks,

and having outwardly-projecting wedges to fit into the wedges upon the disks while the disks are descending to a point opposite their seats and then by the further rotation of the lever to be carried up on said wedges to force the disks to their seats, substantially as shown and described.

3. In a gate-valve the combination of a valve-case having a channel therethrough and having in its walls valve-seats encircling the channel and ways leading to the valve-seats, disk valves in the ways each having an inwardly-projecting collar cut into segmental Wedges, a vibrating lever, and a link pivoted at one of its ends to the lever and at the other end pivoted to the links and having wedges to fit into the Wedges upon the disks while they are descending and then by the further rotation of the lever to be carried up on said wedges to force the disks to their seats, substantially as shown and described.

JAMES POWELL. 

